Figure 3
Spin-polarized conductance of lutetium adatoms on iron monolayer islands.
(a) Constant current topography map of the area of interest. (b) Histograms of constant-height dI/dV values for areas containing two oppositely polarized Fe ML islands and Lu adatoms. Red pair of histograms corresponds to Vbias = −200 mV, green to Vbias = −100 mV and blue to Vbias = +20 mV. For easier comparison, each pair of histograms has been vertically shifted so that the signal from Fe island on the left is zero in all three cases. Note the simultaneous change of polarization of both, the islands and their Lu adatoms, depending on the bias voltage. At −200 mV and −100 mV the island on the left is parallel to the tip moment and the Lu adatoms on it are antiparallel; for +20 mV the situation is reversed, it is the island on the right that is parallel to the tip and its Lu adatoms, antiparallel. Inset in (b) shows in detail the dI/dV distribution near the adatom apices at −200 mV, with no horizontal offset for better comparison.
